Предмет: Алгебра, автор: лёльчик1995

Решите уравнение cos4x+cos2x=0. Укажите корни, принадлежащие отрезку

[-π;π/3]

Ответы

Автор ответа: Ленуля5

0

cos4x+cos2x=0

2*cos3x*cosx=0

cos3x=0 Или cosx=0

x=п/6+пK/3(пи/6+ период /3) или cos x =п/2+пК

Ответ:п/6,-5п/6,-п/2

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